baber/WOPTO huggingface dataset:
Patent KR-20000000319-A (KR)
Inventor: CHO GUANG SUP
IPC: G02F1/1335
Filed: 1999-10-12
Abstract: PURPOSE: A linear electrode typed flat board fluorescent lamp is provided to use a flat board fluorescent lamp as a Liquid Crystal Display(LCD) back lighter for increasing elegance and saving cost. CONSTITUTION: A back lighter for LCD comprises: forming a cylinder typed fluorescent lamp into a flat board type; linearly arranging multiple electrodes in an ordinary aluminum capsule(1). A heating typed electrode using a typical tungsten coil is composed of: an electrode terminal(2); a coil electrode supporting stand(3); a tungsten coil(4); and an auxiliary protecting electrode(5).
Patent KR-20000006845-A (KR)
Title: Plastic spring for pump
Inventor: KIM JUNG SOO
IPC: F16F7/108
Filed: 1999-11-08
Abstract: PURPOSE: A plastic spring for a pump is provided to use for a device for spraying or distributing the contents in a container. CONSTITUTION: A plastic spring is made a fiber-reinforcing plastic satisfying the conditions of:over 1,200 Kg/cm¬2 of sealing strength; over 1,500 Kgf/cm¬2 of bending strength; over 75,000 Kgf/cm¬2 of bending elasticity; over 7.0 Kgf.cm/cm of Izod impact strength; and the plastic spring contains one or two kinds of reinforcing fabrics selected among the glass fabric, carbonic fabric and aramid fabric groups; and also contains one or two kinds of resins among polyamide, polyester, polycarbonate groups and so on.
Patent KR-20010046217-A (KR)
Inventor: KIM MU YEONG
IPC: B29C35/06
Filed: 1999-11-11
Abstract: PURPOSE: A vulcanizing method reduces vulcanizing time to improve productivity of vulcanization and improve adhesive force between a tube rubber and a valve base rubber. CONSTITUTION: A vulcanizing method comprises a step to supply low pressure steam inside a tube to be vulcanized and a step to supply high pressure steam. The step to supply high pressure steam comprises a first high pressure steam supplying step, a forcing discharging step of condensate water generated inside the tube and a second high pressure steam supplying step. The pressure of the low pressure steam is 4 - 7kg/mm¬3. The pressure of the high pressure steam is 11 - 14kg/mm¬3.
Patent KR-20000047658-A (KR)
Inventor: TASUDA TAKAO
IPC: H04L69/40
Filed: 1999-11-16
Abstract: PURPOSE: A bus analyzer, bus reset display method and electronic machine with bus analyzer are provided to reduce the time required for analyzing an area of the bus resetting. CONSTITUTION: A bus analyzer receives a communication packet which is transmitted and received between the individual device included in 1394 bus by using a communication unit. The received communication packet executes a desired processing with a communication recording production unit. The communication packet is recorded on a recording unit as communication recording, when the bus resetting is detected by the communication unit. The bus reset is transmitted to the communication recording production unit as case of the communication packet, and is recorded on the recording unit. The communication record of the recording unit is displayed on a display unit by the communication record production unit.
Patent KR-20000047757-A (KR)
Title: Aqueous developing solutions for reduced developer residue
Inventor: LUNDY DANIEL EDWARD
IPC: G03F7/032
Filed: 1999-11-29
Abstract: PURPOSE: Developing solutions in which the build-up of scum and residue is reduced are provided. CONSTITUTION: An alkaline aqueous developing solution for developing photoresists or the like contains, as an anti-scum agent: A) between about 0.05 and about 1.0 wt% of a first surfactant or surfactant mixture, the first surfactant(s) having the general formula: R-O-(AO)n-H where AO are alkylene oxide units selected from ethylene oxide units (CH2-CH2-O) and propylene oxide units (CH(CH3)-CH2-O) or (CH2-CH(CH3)-O) and mixtures of ethylene and propylene oxide units, either in the mixture of molecules, where R is a hydrophobic group, n is between about 8 and about 200, and B) as a second surfactant, between about 0.05 and 1.0 wt% of an organic salt having the formula: where R is an alkyl or aryl group, preferably phenyl, A is selected from carboxyl, sulfonyl, phosphonyl and mixtures thereof, preferably sulfonyl, M is a charge-balancing cation, and n is between 1 and about 200, preferably between 2 and about 100, the weight ratio of A) to B) being between about 1:5 and about 5:1.
Patent KR-20000047877-A (KR)
Title: Positive resist composition
Inventor: UENISIKAJUYA
IPC: H01L21/027
Filed: 1999-12-03
Abstract: PURPOSE: A positive resist composition that has high sensitivity and high resolution exhibits excellent rectangular pattern profile and is excellent at PCE(Post Coating Delay) stability and PED(Post Exposure Delay) stability. CONSTITUTION: A positive resist composition contains (a) acid generating compound by irradiating radiation and (b) compound having cation polymerizing function. The compound (a) is at least one compound selected form vinyl compound, cycloalkane compound, ring-typed ether compound, lactone compound and aldehyde compound or the compound represented by the following formula A. wherein, Ra, Rb and Rc is independently hydrogen atom, alkyl group or aryl group optionally having substituent, saturated or olefin unsaturated ring to combination of Ra, Rb and Rc.
Patent KR-20010056318-A (KR)
Inventor: CHO DONG HYEON
IPC: F02F3/26
Filed: 1999-12-15
Abstract: PURPOSE: A piston is provided to reduce the discharge of exhaust gas by forming a double vortex of the mixture in a combustion chamber of a piston. CONSTITUTION: A W-shaped combustion chamber(3) is formed on an upper face(1a) of a piston(1). Fuel(4) is injected from a fuel injection nozzle(2) toward the outer wall of the combustion chamber in a tilt angle(theta). An inverted V-shaped rib(7) is protruded toward a central line(8) on a wall face. A peak(9) of the rib faces the injection hole of the fuel injection nozzle and is extended toward upper and lower wall faces(6a,6b) with upper and lower curved faces(7a,7b). Some of the fuel injected from the fuel injection nozzle causes vortexes(A) by colliding to the peak of the rib and flowing along the upper curved face. The other fuel forms other vortexes(B) descending along the lower curved face. Therefore, a double vortex is formed and the mixture of fuel and air is improved.
Patent KR-20010061282-A (KR)
Inventor: CHO JI HUN
IPC: H03K19/177
Filed: 1999-12-28
Abstract: PURPOSE: A programmable logic array using single phase clock is provided to execute precharge and evaluation to each circuit using the single phase clock and to remove clock skew and power consumption. CONSTITUTION: The first and second AND planes(300) are provided with input signal and clock signal and code the input signal. The OR plane(310) is provided with the output from the first and second AND planes(300) and the clock signal and codes the output. The inverter(320) is provided with the output from the OR plane(310) and the clock signal and outputs stabilized output signal. The AND plane(300) has a PMOS transistor(301), three NMOS transistors(302,303,304) and an inverter(305). The PMOS transistor has a gate terminal which the clock signal is inputted to and a source-drain path which is formed between power supply voltage and the first node.
Patent KR-20010061609-A (KR)
Inventor: JANG SANG BIN
IPC: B31C1/00
Filed: 1999-12-28
Abstract: PURPOSE: A winding shaft rotating device of a label winder is provided to form the diameter of a winding shaft to be small by developing the winding shaft with plural branch pipes fitted therein and to precisely conduct the winding of a label. CONSTITUTION: A cylinder device is acted for descending a rotatable support instrument and a winding shaft(2) having a branch pipe(101) inserted therein presses a label(200) to be placed on a pair of rotary rollers(10). A pressing roller(4) descends to be in contact with the top of the branch pipe as the label is fixedly attached. The label is cut and one end of the cut label surrounds the branch pipe and the front end of the label is bent between the winding shaft and a rotary roller by a blade of a cutter. The pair of rotary rollers rotate in the same direction and the label is wound around the branch pipe.
Patent KR-20010065060-A (KR)
Inventor: PARK SE BAI
IPC: C04B18/14
Filed: 1999-12-21
Abstract: PURPOSE: A mixture of refined fly ash and slag powder is provided, which has increased long term strength, lowered heat of hydration, excellent chemical resistance, seawater resistance, heat-proof property, water-proof property and stability. And concrete prepared by using the same is prepared. CONSTITUTION: The mixture is prepared by mixing refined fly ash prepared by first refining the fly ash that is produced by the combustion of soft coal, with slag powder prepared by finely breaking the slag generated from an iron manufacturing process, in a weight ratio of 1:1-2. The concrete comprises the mixture of the refined fly ash and the slag powder, cement, sand, gravel, water and other mixtures.
Patent KR-20010058468-A (KR)
Inventor: LEE YONG HUI
IPC: H01L21/60
Filed: 1999-12-30
Abstract: PURPOSE: A method of searching an alignment pattern is provided to obtain automatically a correlation coefficient threshold value of an alignment pattern by searching and evaluating an alignment pattern in a training process of an alignment pattern. CONSTITUTION: A search image is obtained. An alignment pattern is obtained from the search image. A target finding area and a non target finding area are determined. The target finding area includes the alignment pattern within the search image and the non target finding area does not include the alignment pattern within the search image. An alignment pattern evaluation area is determined by using a size of the alignment pattern and a size of the target finding area. A threshold value of a correlation coefficient is measured by calculating the target evaluation area. A correlation coefficient is measured in the non target finding area.
Patent KR-20010059216-A (KR)
Title: Alternator
Inventor: KIM DAE UN
IPC: F16H7/10
Filed: 1999-12-30
Abstract: PURPOSE: An alternator has multiple pulley ratio system to decrease the pulley ratio over a certain rotation frequency. CONSTITUTION: An alternator comprises a housing(100), a rotary shaft(26) and a pulley(20). The rotary shaft(26) is rotatably installed on the housing(100). The pulley(20) has a main body(21) and a variable device. The main body(21) is fixedly installed on the rotary shaft(26). The variable device is installed to an intrusive groove formed on the outer diameter of the main body(21) and varies the outer diameter of the main body(21) where a belt(V) is installed by the rotation frequency of the main body(21). The diameter of the pulley(20) is varied by the centrifugal force and the pushing force of a spring(23).
Patent KR-20010066306-A (KR)
Inventor: KIM EOM JOON
IPC: H04N7/15
Filed: 1999-12-31
Abstract: PURPOSE: An audio control device of video conference system and a method of the same are provided to transmit and receive audio signal without interruption on the way by recording and outputting in turn audio signal inputted according to sensing of network condition. CONSTITUTION: An input handle(204-1) records momentarily an audio signal including some conference information through a mike. A first network sensing unit(206-1) senses a signal transmission environment of a network and outputs a corresponding signal. A transmission buffer unit(208-1) whose size and number are set up according to the sensed signal transmission environment records the audio signal recorded in the input handle(204-1). A second network sensing unit(302) senses a signal receipt environment of the network and outputs a corresponding signal. A receipt buffer unit(304) whose size and number are set up according to the sensing signal of the second network sensing unit(302) records the audio signal output from the transmission buffer unit(208-1) and transmitted through the network. A plurality of output handle(306-1,...,306-N) records the audio signal output from the receipt buffer unit(304) and outputs it through a speaker.
Patent KR-20000068172-A (KR)
Title: Ｅａａ 길항제로서의 테트라히드로퀴놀린 유도체
IPC: C07D215/48
Filed: 1997-08-14
Abstract: 화학식 (I)의 화합물, 그의 염 또는 그의 대사적으로 불안정한 에스테르. 
     〈화학식 I〉 
     
       
     
     식 중, R은 할로겐, 알킬, 알콕시, 아미노, 알킬아미노, 디알킬아미노, 히드록시, 트리플루오로메틸, 트리플루오로메톡시, 니트로, 시아노, SO 2 R 2 또는 COR 2 (여기서, R 2 는 히드록시, 메톡시, 아미노, 알킬아미노 또는 디알킬 아미노임)이고, 
     m은 0 또는 1 또는 2의 정수이고, 
     R 1 은 (CH 2 ) n CN, -CH=CHR 3 , (CH 2 ) n NHCOCH 2 R 4 또는 O(CH 2 ) p NR 5 R 6 이고, 
     R 3 는 시아노 또는 COR 7 기이고, 
     R 4 는 알콕시 또는 NHCOR 8 기이며, 
     R 5 및 R 6 은 각각 독립적으로 수소 또는 알킬이거나, R 5 및 R 6 은 그들이 결합되어 있는 질소 원자와 함께 헤테로시클릭기를 나타내거나, R 5 는 수소이고, R 6 은 COR 9 기이며, 
     R 7 은 알콕시, 아미노 또는 히드록시기이며, 
     R 8 은 수소 원자 또는 임의로 치환된 알킬, 알콕시, 페닐, 헤테로아릴 또는 헤테로시클릭기이고, 
     R 9 는 R 8 기 또는 NR 10 R 11 기이고, 
     R 10 은 수소 또는 알킬기이고, 
     R 11 은 임의로 치환된 알킬, 페닐, 헤테로아릴, 헤테로시클릭 또는 시클로알킬기이고, 
     n은 0 또는 1 내지 4의 정수이고, 
     p는 2 내지 4의 정수이다.
Patent KR-20000068486-A (KR)
Title: 커넥터 몸체
IPC: G02B6/30
Filed: 1997-09-02
Abstract: 본 발명은 도파관 커넥터내 도파관 패턴을 배치하기 위한 방법 및 장치에 관한 것이다. 토포그래픽 패턴을 포함하는 상기 도파관 커넥터를 견고한 지지체상에 놓인 투명한 고분자 중합체의 다층박막 상방에 두는 바, 다층박막중 적어도 한 층은 코어로 형성되고, 적어도 다른 두개의 층은 코어층보다 낮은 굴절성 인덱스를 가지며 그 일측을 각각 둘러싼 피복재질로 형성되어 있다. 도파관 커넥터를 상기 고분자 중합체의 다층박막에 대해 프레싱함에 따라, 당해 도파관 커넥터내 토포그래픽 패턴이 양각 형태로 상기 박막내로 진입하여 도파관 커넥터에 도파관 패턴을 형성하게 되며, 또한  프레싱후 상기 다층박막은 도파관 커넥터내에 고정된다.
Patent KR-20000036095-A (KR)
Title: Novel polymer additives for forming objects
Inventor: KATOOT MOHAMMAD W
IPC: C08G18/30
Filed: 1997-09-15
Abstract: PURPOSE: Provided are novel methods and compositions related to polymer concrete comprising conventional resins with novel additives to prevent shrinking and cracking of the resin, to accelerate curing and to treat fillers. CONSTITUTION: These compositions and methods can be employed to form large object sand objects of irregular shapes. These compositions and method provide lightweight materials some of which are hard and inflexible, while others are hard and flexible. The method for making a hard-surfaced object comprises: admixing a resin with a monomer, a dispersant, and a polar polymer; adding a gel coat resin; adding a fiberglass; adding an N,N-dimethylaniline, a cross linker, and a catalyst; adding a hardener; adding an initiator; and forming the mixture into the object.
Patent KR-20000057667-A (KR)
Title: Novel carboxy substituted cyclic carboxamide derivatives
Inventor: BURKHOLDER TIMOTHY P
IPC: C07D401/14
Filed: 1997-11-21
Abstract: PURPOSE: Provided are novel carboxy substituted cyclic carboxamide derivatives of formula (1), and stereoisomers and pharmaceutically acceptable salts thereof and their use as tachykinin receptor antagonists. Such antagonists are useful in the treatment of tachykinin-mediated diseases and conditions disclosed herein including: asthma, cough, and bronchitis. CONSTITUTION: A present invention relates to novel carboxy substituted cyclic carboxamide derivatives of formula (1): wherein G1 is CH2 or C(O); G2 is CH2 or C(O); m is 2 or 3; n is 0 or 1; R1 is from 1 to 3 substituents each independently chosen from the group consisting of hydrogen, halogen, -CF3, C1-C6 alkyl, and C1-C6 alkoxy; R2 is from 1 to 3 substituents each independently chosen from the group consisting of hydrogen, halogen, cyano, -CF3, C1-C6 alkyl, and C1-C6 alkoxy.
Patent KR-20000076142-A (KR)
IPC: H05B6/12
Filed: 1998-03-13
Abstract: A kitchen cooktop surface in a material of nature, such as marble may be fitted with induction heating elements providing higher efficiency than mere placing in contact with the lower side of the cooktop. According to the invention the cooktop is hollowed out from the lower side, leaving only a thin partition which is reinforced by means of casting in situ of a ferromagnetic particle loaded material. Alternatively, the top surface may be penetrated, and a central circular piece of the cooktop material may be retained by means of similar casting in situ.
Patent KR-20000076317-A (KR)
Title: 메모리 및 테스트 회로를 갖는 집적 회로
IPC: G11C29/12
Filed: 1998-02-17
Abstract: 본 발명은 메모리 및 테스트 회로를 갖는 집적 회로에 관한 것이다.  메모리(2)는 테스트 회로(3)에 의해 테스트될 수 있으며 데이터 라인(D1, D2), 어드레스 라인(ADR) 및 제어 라인(RAS, CAS, OE)을 통해 상기 테스트 회로(3)와 접속되며, 상기 라인들 중에서 적어도 하나의 라인은 스위칭 수단을 통과하여 지나간다.  스위칭 수단(L, G)은 집적 회로(1)의 외부 단자(6, 7)를 통해 제어될 수 있어서, 상응하는 라인에서의 신호 진행 및 이에 따른 테스트의 타이밍이 외부로부터 영향을 받을 수 있다.  본 발명은 특히 집적 메모리 코어의 자체 테스트를 실현하는데 적합하다.
Patent KR-20010005879-A (KR)
Title: 리튬이온 전지의 제조방법
IPC: H01M2/16
Filed: 1998-02-05
Abstract: 본 발명은, 정극 및 부극과 이온전도층(세퍼레이터)를 접착성 수지로 밀착시켜 정극 및 부극과 세퍼레이터간의 이온전도성을 확보하면서 전극과 세퍼레이터간의 충분한 접합강도가 얻어지는 리튬이온 전지의 제조방법을 제공하는 것을 목적으로 하는 것이고, 수지와 용제의 혼합물로 실온이하에서는 상기 수지가 완전하게 용해하지 않고 있는 접착액(4)을 가온해서 상기 세퍼레이터(3)또는 전극(1,2)의 접착면에 도포하는 공정 상기 세퍼레이터와 전극을 각각의 접착면을 대향시켜서 겹쳐주는 공정 및 상기 접착액을 건조시키는 공정을 순서대로 실시함으로써, 접착액 도포시에는 수지의 용해성을 높여서 균일도포를 가능하게 하고, 도포후는 접착액의 유동성이 저하에서 접착액의 유동성이 저하해서 접착액이 유출하거나 침투하는 것을 방지해서 양호한 접착이 실시된다.
Patent KR-20010020195-A (KR)
Title: 난연성 폴리아미드
IPC: C08G69/42
Filed: 1998-05-27
Abstract: 조성물의 중량을 기초로하여 멜라민시아누레이트를 2~5중량%, 그리고 인을 약 0.07~약 1중량% 또는 바람직하게는 약 0.07~약 0.5중량% 포함하는 난연성 폴리아미드 조성물. 인은 바람직하게는 중합된 카르복시포스핀산 화합물을 포함하는 공중합폴리아미드로서 제공된다.
Patent KR-20010013253-A (KR)
Inventor: BARINAGA JOHN A
IPC: B41J2/125
Filed: 1998-06-02
Abstract: The present invention is a replaceable ink container for use with a printing apparatus. The printing apparatus of the type having out-of-ink detection. The replaceable ink container (20) includes a fluid reservoir (24) having an outlet (28). The outlet is configured for connection to a fluid inlet (60) associated with the printing apparatus. Also included in the replaceable ink container is an actuator engagement device for engaging an actuator (40) associated with the printing apparatus. The actuator is of the type that is movable between a first position wherein an out-of- ink signal is generated and a second position. The actuator engagement device is disposed and arranged to engage the actuator to prevent movement of the actuator from the second position to the first position thereby preventing the out-of-ink signal.
Patent KR-20010014378-A (KR)
IPC: H01B7/295
Filed: 1999-05-12
Abstract: 비할로겐계 난연제를 사용하고, 플레트 케이블의 제작에 적합한 이하의 성분 (A), (B) 및 (C): 
     (A) 폴리에스테르계 수지; 
     (B) 질소함유 유기 난연제; 및 
     (C) 붕소 화합물 
     로 구성된 난연성 접착제 또는 난연성 접착필름에 대하여, 양호한 전기적 절연성과 접착성을 유지하면서, 할로겐계 난연제에 필적하는 난연성을 실현할 수 있다.
Patent KR-20000053702-A (KR)
Title: Portable dance training apparatus
Inventor: MUN SANG PIL
IPC: A63F13/92
Filed: 2000-01-08
Abstract: PURPOSE: An apparatus for practicing dance is provided, which lets an user practice with eyes by watching change of foot location through a screen, can be portable with small size. CONSTITUTION: A portable apparatus for dance practice has a liquid crystal screen(4) demonstrating location where a foot goes and having proper size for carrying, a menu select switch(8) choosing the degree of difficulty of dance action and a kind of background music from the screen, and a case(2) protecting the screen for carrying. Input buttons(12) for replacement of dance action can be added to the case for inputting foot motions with fingers.
Patent KR-20000057746-A (KR)
Inventor: KELREI PATRICK J
IPC: H01L21/28
Filed: 2000-01-12
Abstract: PURPOSE: A method for manufacturing a split-gate memory cell is provided to increase a reading speed caused by a high on-current by having a shallow selection-gate oxide compared to a conventional split-gate cell. CONSTITUTION: A method for manufacturing a split-gate memory cell comprises the steps of: forming a tunnel oxide layer on a silicon substrate; forming a first conductive layer on the tunnel oxide layer; separating the conductive layer into two separated layers, and etching a trench on the conductive layer to from a space between the separated layers, so that one of the separated layers becomes a first gate electrode and the other becomes a floating gate electrode; forming a dielectric layer on the exposed surface; and evaporating a second conductive layer that will become a second control gate electrode, on the dielectric layer.
Patent KR-20010073497-A (KR)
Title: Reverse fund investment and loan method
Inventor: LEE SUNG CHANG
Filed: 2000-01-17
Abstract: PURPOSE: A reverse investment and loan method is provided to enable an investor to select a financial organization offering the highest earning rate and to enable a loan applicant to select a financial organization offering the lowest interest rate. CONSTITUTION: The method comprises steps of a service operator collecting investors(s300), the service operator receiving personal data and estimated investment amount from the investors and storing them at a database(s310), the service operator offering the estimated investment amount data to a plurality of financial organizations and requesting an earning rate on the investment to each financial organization(s320), the service operator receiving the earning rate data from the financial organizations(s330), the service operator storing the earning rate data at a database(s340), the service operator searching for the financial organization offering the highest earning rate in the database(s350), the operator offering the searched financial organization data with the offered earning rate to the investors(s360), the investors determining the investment and informing the service operator of the investment inclination(s370), the investor investing a determined fund amount for a set time(s380), and the financial organization paying the investment earning money to the investor(s390).
Patent KR-20010075816-A (KR)
Title: Method for quality evaluation of radish
Inventor: KIM JONG KEE
IPC: G01N33/02
Filed: 2000-01-19
Abstract: PURPOSE: A method for grading quality of radish is provided to grow, process, and produce efficiently a radish by providing a method for grading quality of the radish. CONSTITUTION: An investigation process for domestic radishes is performed by growing 13 sorts of domestic radish. A correlation between a root shape of the radish and a hardness of the radish is examined by investigating each growth period of the radishes and measuring the hardness of a tissue of the radish. A correlation between the hardness of the radish tissue and internal material of the radish is examined by extracting and analyzing uronic acid, cellulose, and non-cellulose neutral sugar from the radish after a cellular wall is extracted from the radish. A correlation between the hardness of the radish tissue and the composition of the cellular wall is examined by measuring contents of positive ions of the radish tissue. A correlation between starch of the radish and chromaticity of the radish is examined by measuring the chromaticity of the radish.
Patent KR-20010076661-A (KR)
Title: Semiconductor device and method for fabricating thereof
Inventor: JUNG JONG WAN
IPC: H01L29/49
Filed: 2000-01-27
Abstract: PURPOSE: A semiconductor device and a fabrication method thereof are provided, where an impurity concentration of a gate electrode differs partially, to make a threshold voltage of a channel end part equal to a threshold voltage of a center part. CONSTITUTION: A semiconductor substrate(20) is divided into an active region(21) where a semiconductor device will be fabricated and an isolation region(22) to isolate active regions electrically. The isolation region is formed by forming a trench in the semiconductor substrate and filling the trench with an insulation film like a silicon oxide. A gate electrode(23) is formed to cross the center part of the active region, and a source and a drain are formed in the active region on both sides of the gate electrode. An impurity concentration of the first part(23a) of the gate electrode located on an end of a channel(26) differs from an impurity concentration of the second part(23b) of the gate electrode located on the center part of the channel. That is, the impurity concentration of the first part is lower than that of the second part.